20121123201 has 4 divisors (see below), whose sum is σ = 26828164272. Its totient is φ = 13414082132.

The previous prime is 20121123179. The next prime is 20121123203. The reversal of 20121123201 is 10232112102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20121123201 - 2¹⁹ = 20120598913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121123203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3353520531 + ... + 3353520536.

It is an arithmetic number, because the mean of its divisors is an integer number (6707041068).

Almost surely, 2^20121123201 is an apocalyptic number.

It is an amenable number.

20121123201 is a deficient number, since it is larger than the sum of its proper divisors (6707041071).

20121123201 is an equidigital number, since it uses as much as digits as its factorization.

20121123201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6707041070.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20121123201 its reverse (10232112102), we get a palindrome (30353235303).

The spelling of 20121123201 in words is "twenty billion, one hundred twenty-one million, one hundred twenty-three thousand, two hundred one".